Why I never use my personal credit card for free trials, and what I do instead
Briefly

Online shopping requires vigilance, particularly regarding sharing credit card details with lesser-known vendors. Frequent product and service reviews often necessitate using complimentary accounts offered by vendors, which typically require credit card information for registration—even if no charge will be applied initially. One reviewer shared an experience where, after a year of free service, unexpected charges approached $500 due to automatic billing. This highlights the importance of monitoring subscriptions and accounts post-trial to avoid unforeseen expenses.
A few years back, I went through a signup process, gave my card number, entered my coupon code, and was able to test for free. But 12 months later, I was suddenly charged almost $500.
Read at ZDNET
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